[Feature]: Support */runs/{run_id}/stream and */runs/{run_id}/wait in acp client

[aduminuc]

Problem Statement

support the new endpoints specified here agntcy/acp-spec#40 in ACP Client

Proposed Solution

Add methods to the client for the above endpoints

Alternatives Considered

No response

Additional Context

No response

Checklist

• I have read the contributing guidelines
• I have verified this does not duplicate an existing feature request